<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>这里是头</title>
</head>
<body>

<!--定义了一个碎片-->
<span th:fragment="head">
    <span>
      this is header page Cntent  Fragment!!!
    </span>
</span>

</body>
</html>